The Bossier banner. [volume] (Bellevue, Bossier Parish, La.) 1859-1952, 1887-08-25
* SCIENCE AND INDUSTRY.


rs Fifty million carbons were manu-
faetured last year for use by electric
light companies. - sam as,t ..s.ss
--Do not lubricate an oxygen pump
with oil, but with soapsuds or some
thing that will not burn in oxygen.
--Fifty-fve million cans were used
in this country last year for canning
tomatoes, and as many as 100000 000s
cans were used for other vegetables.
BY careful experiments, M. Bloch
has determined that it takes 1-72 Of a
second longer to hear sound than to
see a sight, and 1-21 of a second longer
to feel a touch than to see sight
Arkansaw TrGeeler. @ #
a. Although there are 1000 less tan
neries in this country than there were
twelve years ago, the aggregate OF
leather produced is much greater, ow-
ing to the increased capacity of the
larger ones which remained in opera
tion, and many large ones annually
erected add their product.
1t has heretofore been supposed
that the implements of jade found in
British Columbia and elsewhere on the
Pacific coast must be of Asiatic origin,
as the mineral was not known to exist
in Western America; but boulders OF
jade have now been discovered in the
valley of the Frazer river, and jade
also occurs in Alaskan Y Ledger.
/ Judge Macarthur thinks that the
rules of trades organizations which
limit the number of boys who may be
received at apprenticeship, though in
tended for good, actually do great
harm to American industries. They
exclude Americans from the trades,
and make us dependent upon foreign
| ers who come here with their trades al
readyflearned.-Public Opinion. :
"A Glasgow engineering firm have
constructed what is said to be the larg-
est planning machine in the world,
specially intended and designed to be
employed in connection with the prep
aration of steel plates for the girders OF
railway bridge in New South Wales.
The weight of this vast machine is
stated to be some thirty-five tons, and
it is capable of planning the edge of a
plate thirty-eight feet in length by five
| feet wide.
I - An English physicist has, it is
said, made a perfect pendulum by sus-
i pending a. lead shot by a single fiber Of
| cocoon silk in vacuum produced by a
! Sprengel pump. The shot, one-six-
teenth of an inch in diameter, weighs
one-third of a gram, is suspended by 8
two-foot fiber, and is placed In a tube
three-quarters of an inch internal di
ameter. 1t has a vibrational range o.
quarter of an inch on each side of mid
| position, the vacuum being equivalent
to one-tenth of a nillionth of an at
mosphere. Budget
The extreme delicacy of the sens'
Of smell is illustrated in recent ex
pertinent with mercaptan, liquid o
extremely offensive odor. 1t wa
found that 1-460. .000,0 Of a milli
gramme was detachable, quantity 25'
times less than the minimum of sodium
recognizable by the spectroscope. !
is not every olfactory nerve, however
that can detect so minute quantity
Some unfortunate (or fortunately peo
pie seem unable to smell any thing. :
~ +. Examiner. a s.A 81
Il AT the recent reception of the Roya
Society of London, Mr.. c. V. Boys eS
. hibited the actual working of the appa
: ratus which he has devised for the pun
pose of drawing out glass, minerals an
metals, when heated, into extremel
fine wire or thread. The Athen9u,
says: "A thin rod of the material wa
: fastened to the tail of an arrow an
heated at the end Of an oxhydroge
flame. The trig ger of cross-bow wa
then pulled and the arrow shot. /
: this way. quartz can be. drawn so fin
4 that the thinnest parts are beyond th
< power of any microscope to- defin
r them" .-4..4s.- s.s.4..